LG AMNH076LQL0 Service Manual page 179

2) Troubleshooting CH03
Display
Title
code
Communication
03
Wired R/C
Wired R/C
12V S GND
12Vdc
V
Check the Volt.
Check Point
1. Check the wire connection. (Open / Short)
2. Check the soldering state of connector. (Soldered poorly)
3. Check the volt. Of main PCB power source. (DC 12V, DC 5V)
4. Check the installation of wired remote controller. (Noise interference)
Cause of error
• Open / Short
• Wrong connection
Indoor Unit
12V S GND
12Vdc
V
Check the Volt.
Repair the connection
Check point & Normal condition
• Connection of wire
• Main PCB Volt. DC12V
• Noise interference
CN-REMO
Repair or Change the PCB.
Repair or Change the main PCB.
Adjust the state of installation
Troubleshooting Guide
Service Manual 179